Chemistry Lab 2

Pre-Lab Study Questions 1. What property of oil makes it float on water? Water has more density than oil There is more water mass than oil per unit volume 2. Why would heating the gas in a hot air balloon make the balloon rise? Because there is hot air inside the baloon (from the heater/bun and it makes is less dense than the air of the outside the baloon 3. What is the difference between density and specific gravity? Ratios of each other. Density is the measure of the amount of mass per volume. Specific gravity is a measure of density relative to the density of a reference substance 4. An object has a mass of 18.4 g and a volume of 11.2 mL. a. What is the density of the object? p = m = 1.6 g/m² b. What is the specific gravity of the object? 18.49 - It is a number with no units olensity of substance g/mL density of water 1.00g/mL c. Will the object sink or float in water? Object will sink 11.2mL b. What mass, in grams, of the liquid is in 34.6 mL of the liquid? 1 (g) of liquid volume…

For question number 2 does that mean weigh the dish to 0.001g without clearing it ?

17. A stat chemistry test is requested. Which of the following tubes is recommended to use? * O A. Serum separator tube O B. Red top tube with silicon O C. Orange top tube O D. Royal blue top tube 18. Which of the following is not correct about the evacuated tube 1 p system?* O A. Multiple collection of blood B. Closed system O C. Most common means of blood sampling D. Minimal risk of contamination

PLEASE ANSWER ALL THE ITEMS. WILL GIVE YOU THUMBS UP AND GOOD RATING TRUE OR FALSE 1. The specific gravity bottle method can be used for both liquid and solid state. 2. The pycnometer method is the official USP method for determining specific gravity. 3. The density of water at 25 degrees Celsius is 0.9973 g/ml. 4. There are no limitations for miscibility.  5. Matter with a density close to zero will float. 6. Solutions are always clear, transparent and colorless. 7. Substances with a density lesser than 1 g/ml will sink. 8. The Westphal balance is more accurate than the specific gravity bottle method. 9. The buoyant force is less than the weight of the water displaced by the object. 10. All matter has a greater density than zero.  11. Molar concentrations are not temperature-dependent. 12. A substance heavier than water has lower specific gravity

AutoSave File Home Insert Draw Design X Paste Clipboard Page 4 of 9 Off Times New Roman 11 BIU ab x₂x²A 2. A CURE What's in Your Water - Introduction and Prelab Ass Layout References Mailings Review View A A Aa A · E ·5·|==| = = = - Font 61°F Cloudy Next, look at Graph 2. Based on this graph, if you make less than $39,524 per year, what is the average number of hazardous waste sites within one square mile of you? 2295 words What about if you make more than $65,876 per year? F What does this tell you about where hazardous waste sites might be located, and who might be affected by them? English (United States) Text Predictions: On O Search Paragraph Accessibility: Investigate

To make 100mL of 0.15M (150mM) NaCl, weigh ______ grams of NaCl, place in a graduated cylinder, and add water to make the total volume _____ mL

Question 3 please. It's a practice exam. Will post the answer with it.

Please help me answer and use pg 31 for questions A1 and A2 and pg 32 just for questions C1- C5 Thank you!   Pg. 31 Density and Specific Gravity              A. Density of Liquids A.1 Density Of water             1. Volume (mL) = ?             2. Mass of graduated cylinder= ?             3. Mass of cylinder + liquid= ?             4. Mass of liquid= ?             5. Density= ?                         (Show Calculations) A.2 Density of an Unknown liquid             1. Type of liquid sample= ?                  Volume of liquid= ?             2. Mass of graduated cylinder= ?             3. Mass of graduated cylinder + liquid= ?             4. Mass of liquid= ?             5. Density= ?                         (Show Calculations) Pg. 32 C. Density Of Solids             1. Mass of solid= ?             2. Initial water level= ?             3. Final water level with solid= ?             4. Volume of solid (3-2)             5. Density of the solid=     g/mL ?                         (Show…

Make a dilution series to get to 1:100. Start with making 1:10 dilution by adding 1mL of sample and 9mL of diluent, now continue the series to get to 1:100

Density of lead 75.63g (4 rods), start 21.0 ml, end 16.80ml

Answer questions 1 and 2 according to the data given. Dater Weight of cream i: 326 kỳ. Table shows some data obtained directly from Lactascan instrument. Fat % SNF % Lacto- density 27.32 30.23 Raw milk 4.15 7.97 Skim milk 0.08 8.26 Q1. Calculate fat percent of creamn A) 46 B) 28 (C) 3D D) 0.046 آدرما 396 100 x Q2. Calculate efficiency of the cream separator. A) 100% B98% C) 97% D) 96% E) 87.2% amount 2500 L E) 0.28

My Data: Ensure Nutrition Shake: 0.038 g/mL Class Data: Group 7:Ensure: 0.0233 g/mL Is 0.0233 g/mL accurate, precise, both, or neither?

4. A fat sample with combination of acids contain standard hydrochloric acid for blank and sample with 8mL and 5mL respectively. The normality of the standard hydrochloric acid is 0.93N and the weight of the sample is 3 grams. Calculate the saponification value.

Convert 450 m2/kg into cm2/g. Need detailed explanation for solution.

Show complete solution. Round everything to four decimal places and box all final answers. Show all units.

1. A 25-mL specific gravity bottle was found to weigh 46.05 g when filled with water, and 52.93 g when filled with the ophthalmic solution. If the empty specific gravity bottle weighs 21.04 g, what is the specific gravity of the ophthalmic solution?   a 0.784   b 0.870   c 1.149   d 1.275

Data of milk: (first trial) Mass of milk: 104.4579g Concentration of NaOH (M): 0.09639 Volume of NaOH solution used: 5.5 mL Data of milk: (2nd trial) Mass of milk: 103.8405g Concentration of NaOH (M): 0.09639 Volume of NaOH solution used: 5.3 mL

19 Results Table: Part B Part C Cylinder Pipet 1. Density of first volume of saline 2. Density of second volume of saline 3. Density of third volume of saline 4. Average density 5. Density range 6. % error ne

A pipet delivers 10.9 mLmL , 10.1 mLmL , and  10.9 mLmL  in consecutive trials. Find the mean volume of the samples.

Current Attempt in Progress From the curves shown in Animated Figure and using the following Equation, determine the rate of recrystallization for pure copper at the several temperatures. Make a plot of In(rate) versus the reciprocal of temperature (in K-1). (a) Determine the activation energy for this recrystallization process. (See Section FACTORS THAT INFLUENCE DIFFUSION.) (b) By extrapolation, estimate the length of time required for 50% recrystallization at room temperature, 20°C (293 K). (a) i kJ/mol (b) i days

ALEKS - Alec Nema - Knowledge x G converta^4 to cm^4- Google S x AFreezing Point Depression and Bc X iCPa7ZMmym9SLFOBedXazQM4lzqmR-1UH_pgXn9vQgZypE -→ C合 www-awu.aleks.com/alekscgi/x/Isl.exe/1o_u-lgNs convert m^4 to cm^4- Google Search 出 Apps Sprouts Academy. 6 Online Tutoring C 400 Request Head google.com Question 20 Knowledge Check A NASA spacecraft measures the rate R of at which atmospheric pressure on Mars decreases with altitude. The result at a certain altitude is: 1 R=0.0914 kPa•km Convert Rto J.cm -4 J cm I Don't Know Submit O2020 McGraw-Hill Education, All Rights Reserved. Terms of Us Type here to search II

Purpose - Part 2: The second purpose is to determine the relationship between the ml, g, and cm³ of the same amount of water. Procedure - Part 2: 1. Using a ruler, measure the length and the width of the inside of your box to the nearest 0.1 cm. Record the values in the table below. 2. Each person in your group chooses a value between 20 and 100. Record everyone's value in the last column. 3. Carefully place the box and water on the balance. Measure the mass of the box and water and record the value on your data page. 4. Fill the graduated cylinder with the amount of water you wrote in the first row of the last column. Pour that water into your box. Using a balance, measure the mass of your box to the nearest 0.1 g. Record the value on your data page. 5. Subtract the mass of the box to determine the mass of the water. 6. Measure the height of the water inside the box. 7. Find the Volume of the box by multiplying length x width x height. 8. Repeat this procedure with 3 volumes that you…

A pipet delivers 10.9 mLmL , 10.1 mLmL , and  10.9 mLmL  in consecutive trials. Find the mean volume of the samples.  =  Answer = 10.6 mL Part B What is the average deviation from the mean for the above samples?

Aa 09.

Volume: 5.8 cm Density: 53 g/cm up 3 Object C: Mass: 3.1 grams Volume: 4 cm Density 1 g/cm up 3 Object E: Mass: 4 grams 7. Analyze: Drag objects C and E into the water. Estimate the percentage of these objects that are submerged below the waterline. List these estimates below: Object C: | Object E: How do these estimates relate to the densities you calculated above? 8. Think and discuss: Why can't you use this Gizmo to measure the densities of objects B, D, and F? If possible, discuss your answer with your classmates and teacher. B,D,F do not float so we cannot find their mass based on water displaced 9. Challenge: What can you say about the densities of objects B, D, and F? Is there a way to compare the relative densities of these three objects? Explain.

Density Lab (Need help plotting this graph) How to plot this graph from the data sheet (see picture attached) with mass of solution (on y-axis) vs volume of solution (on x-axis) for the 0%, 10%, 20%, 30%, 40%, 50%, 60% sucrose solutions so that it is all on one graph? There should be seven sets of data with seven best-fit lines on one graph. The y-intercept of the best-fit line is set to 0. Please include how to setup the data in excel spreadsheet to plot the graph. Thank you

Show complete solution. Round everything to 4 decimal places. Show all units and box all final answers.

Standardization of a Solution lab Discuss two possible sources of error for this experiment

Studying for an exam and this is a sample lab from YouTube. Hoping you can form an answer key for me. Thank you. Watch the video “Decomposition of Sodium Bicarbonate (baking soda)and use the data in the video to answer the questions in the sample lab report. Thank you.

_____1. Which of the ff you can NOT use to measure liquids? a) beaker b) serological pipet   c) graduated cylinder   d) volumetric pipette _____2. It can be used to contain samples for heating with flames >400 °C a) test tube b) O-ring   c) Bunsen burner  d) crucible with cover _____3. The ff can be used for boiling a solution of salt, EXCEPT a) beaker b) Bunsen burner   c) Buchner funnel  d) Wire gauze ____4. Which of the should be used when you want to separate OIL and WATER? a) buret b) separatory funnel  c) buchner funnel  d) Pasteur pipette

When I balance it out with 2,15,10 and 10. Does not work I'm confused pls help.

Data Collection Mass of the original sample of mixture (g) 1.547 Mass of recovered naphthalene (g) 0.511 Mass of recovered 3-nitroaniline (g) 0.480 Mass of recovered benzoic acid (g) 0.472 % by mass of naphthalene in original sample % by mass of 3-nitroaniline in original sample % by mass of benzoic acid in original sample Total percent recovered You find a separatory funnel set up in a fume hood. There are clearly two visible layers. Describe a method you could use to determine which layer is the aqueous layer. Normal BIIIU X2| X² | → EE E fx | ® If you had a mixture of butyric acid and hexane, how would you separate the two compounds? Normal BII|U X2 | X² | → fx |